%0 Journal Article
%T High statistics measurement of Ke4 decay properties
%A S. Pislak
%A R. Appel
%A G. S. Atoyan
%A B. Bassalleck
%A D. R. Bergman
%A N. Cheung
%A S. Dhawan
%A H. Do
%A J. Egger
%A S. Eilerts
%A H. Fischer
%A W. Herold
%A V. V. Issakov
%A H. Kaspar
%A D. E. Kraus
%A D. M. Lazarus
%A P. Lichard
%A J. Lowe
%A J. Lozano
%A H. Ma
%A W. Majid
%A A. A. Poblaguev
%A P. Rehak
%A A. Sher
%A Aleksey Sher
%A J. A. Thompson
%A P. Tru£żl
%A M. E. Zeller
%J Statistics
%D 2003
%I arXiv
%R 10.1103/PhysRevD.67.072004
%X We report experimental details and results of a new measurement of the decay K+ -> pi+pi-e+nue (Ke4}. A sample of more than 400,000 Ke4 events with low background has been collected by Experiment 865 at the Brookhaven Alternate Gradient Synchrotron. From these data, the branching ratio (4.11+-0.01+-0.11)*10**(-5) and the pi-pi invariant mass dependence of the form factors F, G, and H of the weak hadronic current as well as the phase shift difference delta00-delta11 for pi-pi-scattering were extracted. Using constraints based on analyticity and chiral symmetry, a new value with considerably improved accuracy for the s-wave pi-pi-scattering length a00 has been obtained also: a00=0.216+-0.013 (stat.)+-0.002(syst.)+-0.002(theor.).
%U http://arxiv.org/abs/hep-ex/0301040v1